Since the bar is built under a deck and the deck above was not designed to have a water proof room below it, we had to come up with a way to stop and drain the water away from the new room and bar area under this deck. I came up with idea of a three stage process.

Stage one was using the PVC core flute to catch and drain the out from under the deck. Whilst this catches most of the water it is impossible to catch it all because the the upper deck was added to the house and wasn't to have anything below it.

Stage two and the most important one basically stop the water on the other side of the deck and drain it off the side, to do this we put a layer of polyethylene, then a layer of H3 treated plywood so we can then put down a layer of PVC lino. This is a double layer of water proofing with the polyethylene and lino (both being PVC) The ply is just puely there to make the lino easier to lay on a flat surface. It also means it won't crease to the shape of the deck.
Finally we will put a layer or outdoor carpet this is because wet lino is slippery and not as attractive as carpet. Basically the carpet is the fake grass looking stuff, but grey instead of green.

The final stage is the ceiling itself, if by chance any water gets through this, the ceiling is H3 treated ply not gib, or mdf or the like... so it can handle a little bit of water. But since stage two has been done I have not seen any sign of water coming from the upper deck and am confident of it working.

All wood used including the ply is H3.2 treated and therefore can handle getting wet without rotting.

Cutting polyethylene
on main lower deck

Cutting ply on main deck

Side deck with polyethylene laid and laying the ply ready for the lino.

Lino laid even goes up under the sliding door and all.

Lino and polyethylene trimed ready for a nice flashing of some description.

Oh and new section done... ready for some french doors... might have to make them myself. Then lin the walls.

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